• What does stack change? How is it adjusted? Saddle height? spacers?


    The problem with the headtube length is that it varied too much, bottom bracket and fork length are two of the main reason why it's not easy to measure your fit based on the headtube length on it's own, a lower BB on a 140mm headtube will feel quite high, whether a higher BB make the same headtube felt quite low.

    A really long fork will required a shorter head tube to have an idea Stack for the frame size, that's why CX bicycle appear to have smaller head tube than the road bike for example.


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